LU-6142 fid: Fix style issues for fid_store.c

LU-6142 fid: Fix style issues for fid_store.c

This patch fixes issues reported by checkpatch
for file lustre/fid/fid_store.c

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.super@gmail.com>
Change-Id: I66c039e18963d2596f681a89c7ea1f30967d8879
Reviewed-on: https://review.whamcloud.com/38276
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>